Free Embryonic Development MCQs with Answers
46 Embryonic Development MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Embryonic development begins after fertilization with cleavage and formation of the morula and blastula, followed by gastrulation and the establishment of germ layers. It includes organ formation, tissue differentiation and early growth, rather than the later increase in size associated with postnatal development.
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- A. Amnion
- B. Chorion
- C. Yolk sac
- D. Allantois
Explanation: The embryonic mass is the mass of cells inside the embryo that will eventually give rise to the definitive structures of the fetus.
Correct answer: Chorion- A. X selection
- B. D selection
- C. L selection
- D. C selection
Explanation: Trophoblast cells begin to display adhesion molecules on their surface soon after the blastocyst hatching.
Correct answer: L selection- A. First trimester
- B. Second trimester
- C. Third trimester
- D. Both A and B
Explanation: During pregnancy, the fetal sex becomes apparent during the second trimester, which is around the 13th to 16th week of pregnancy.
Correct answer: Second trimester- A. A
- B. B
- C. C
- D. D
Explanation: The primitive streak is a key structure that forms during early embryonic development and marks the beginning of gastrulation.
Correct answer: C- A. Brain
- B. Muscles
- C. Skeleton
- D. Bones
Explanation: The brain is formed from ectodermal tissue. During embryonic development, the ectoderm is one of the primary germ layers that gives rise…
Correct answer: Brain- A. Multicellular fertilised egg
- B. Single fertilised egg
- C. Hollow blastula
- D. Gastrula
Explanation: All animals, from simple sponges to complex humans, begin their lives as a single fertilized egg cell, also known as a zygote.
Correct answer: Single fertilised egg